1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright 2002 Integrated Device Technology, Inc. 4 * All rights reserved. 5 * 6 * DMA register definition. 7 * 8 * Author : ryan.holmQVist@idt.com 9 * Date : 20011005 10 */ 11 12 #ifndef _ASM_RC32434_DMA_V_H_ 13 #define _ASM_RC32434_DMA_V_H_ 14 15 #include <asm/mach-rc32434/dma.h> 16 #include <asm/mach-rc32434/rc32434.h> 17 18 #define DMA_CHAN_OFFSET 0x14 19 #define IS_DMA_USED(X) (((X) & \ 20 (DMA_DESC_FINI | DMA_DESC_DONE | DMA_DESC_TERM)) \ 21 != 0) 22 #define DMA_COUNT(count) ((count) & DMA_DESC_COUNT_MSK) 23 24 #define DMA_HALT_TIMEOUT 500 25 26 static inline int rc32434_halt_dma(struct dma_reg *ch) 27 { 28 int timeout = 1; 29 if (__raw_readl(&ch->dmac) & DMA_CHAN_RUN_BIT) { 30 __raw_writel(0, &ch->dmac); 31 for (timeout = DMA_HALT_TIMEOUT; timeout > 0; timeout--) { 32 if (__raw_readl(&ch->dmas) & DMA_STAT_HALT) { 33 __raw_writel(0, &ch->dmas); 34 break; 35 } 36 } 37 } 38 39 return timeout ? 0 : 1; 40 } 41 42 static inline void rc32434_start_dma(struct dma_reg *ch, u32 dma_addr) 43 { 44 __raw_writel(0, &ch->dmandptr); 45 __raw_writel(dma_addr, &ch->dmadptr); 46 } 47 48 static inline void rc32434_chain_dma(struct dma_reg *ch, u32 dma_addr) 49 { 50 __raw_writel(dma_addr, &ch->dmandptr); 51 } 52 53 #endif /* _ASM_RC32434_DMA_V_H_ */ 54